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"... Ugh. nearly all customers were using pop3 like IMAP- 'leave mail on server' the problem was that UIDLS needed to stay the same, (the UIDL value is an identifier of a pop3 message- the pop3 client uses it keep track of what messages are new in the pathalogical 'leave messages on server' scheme. If we changed the UIDLs, all messages would be 'new' to the mail client and customers would scream.) and qpopper UIDLs contain characters that can't be in filenames, while courier-imap's pop3 daemon uses the UIDL for the filename... ..."

Not write a whole system app but the tools (like "duplo") so other devs can use them without shooting themselves in the foot having to learn or experiment in very specific niches.



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